create_rectangle · MCP Figma MCP: Risk & Policy

WHAT IT DOES

What create_rectangle does on MCP Figma

AI agents use create_rectangle to create or update resources in MCP Figma — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your MCP Figma environment.

WHY IT NEEDS A POLICY

Why create_rectangle needs a policy

Creating a rectangle in Figma is a Write operation—it creates new design elements that can be subsequently modified or deleted. The impact is bounded to a single design file and reversible, making it medium severity. Confidence is high because the tool's purpose is explicitly stated as creation with no destructive or irreversible capability.

From the tool's definition Tool name 'create_rectangle' and description 'Create a new rectangle in Figma' indicate data creation. The server description states it supports 'element creation' and 'modify Figma designs programmatically'. This is a reversible creation operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_rectangle Rate-limited

create_rectangle stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "create_rectangle": {
      "limits": [
        {
          "counter": "create_rectangle_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches MCP Figma, so you can run agents against it safely.

FAQ

Questions about create_rectangle

What does the create_rectangle tool do? +

Create a new rectangle in Figma. It is categorised as a Write tool in the MCP Figma MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_rectangle? +

Register the MCP Figma MCP server in PolicyLayer and add a rule for create_rectangle: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches MCP Figma. Nothing to install.

What risk level is create_rectangle? +

create_rectangle is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit create_rectangle? +

Yes. Add a rate_limit block to the create_rectangle rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block create_rectangle completely? +

Set action: deny in the PolicyLayer policy for create_rectangle. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides create_rectangle? +

create_rectangle is provided by the MCP Figma MCP server (yelowflash09/figma_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.